Although they are out of sight and out of mind except when they spring a leak, water and sewer systems are more vital to civilized society than any other aspect of infrastructure.

Rapidly deteriorating roads and bridges may stifle America’s economy and turn transportation headaches into nightmares, but if the nation’s water and sewer systems begin to fail, life as we know it will too. Without an ample supply of water, people don’t drink, toilets don’t flush, factories don’t operate, offices shut down and fires go unchecked. When sewage systems fail, cities can’t function and epidemics break out.

“All the big cities have these problems, and to me it’s the unseen catastrophe,” [George S. Hawkins, general manager of the District of Columbia Water and Sewer Authority], said. “My humble view is that the industry we’re in is the bedrock of civilization because it’s not just an infrastructure that is a convenience, that allows you to get to work faster or slower. At least with bridges or a road, people have some idea of what it is because they drive on them and see them. ”

And just like roads and bridges, the vast majority of the country’s water systems are in urgent need of repair and replacement. At a Senate hearing last month, it was estimated that, on average, 25 percent of drinking water leaks from water system pipes before reaching the faucet. The same committee was told it will take $335 billion to resurrect water systems and $300 billion to fix sewer systems.